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8.氢原子能级图如图所示，大量处于n=4能级上的氢原子向低能级跃迁时会发出不同频率的光。下列说法正确的是E/eV映光终人温山，话00------==08甜-1.512-3.4-13.6A.发出的波长最长的光对应的光子能量为10.2eVB.发出的频率最高的光对应的光子能量为12.75eVC.用这些光照射逸出功为3.20eV的钙金属表面，能照射出光电子的光最多有4种D.用这些光照射逸出功为3.20eV的钙金属表面，逸出光电子初动能的最大值为8.19eV【答案】B【解析】这些光中波长最长的光，频率最小，能量最小，对应的光子能量为一0.85eV一(1.51eV)=0.66eV,A错误；这些光中频率最高的光对应的光子能量为一0.85eV一(13.6eV)=12.75eV,B正确；用这些光照射逸出功为3.20eV的钙金属表面，能照射出光电子的光最多有3种，C错误；用这些光照射逸出功为3.20eV的钙金属表面，逸出光电子的最大初动能为Ek=hv-W。=12.75eV-3.20eV=9.55eV,D错误。

第二节（满分25分）One possible version:I now had an idea to help her.As long as she achieved one goal,like controlling her temper,respectingteachers and classmates,or having good table manners,we would celebrate at Dairy Queen.I also wentshopping with her after school and guided her to observe people in the mall.She began to realize that everyoneused their own way to fight for their own life and she needed to start doing in school what she was supposed todo.Gradually,I built a firm relationship with Amanda.At the end of this third grade,Amanda's progress really surprised me.Her social skills had improveddramatically and her ability to deal with people she did not like was advancing.What's more,she had succeededin passing two of her standardized tests and she was close to reading on grade level.This year was alsoremarkable for me,a beginning teacher,for I've learned that great patience and persistence in teachingreally pay off.